Those daylight simulators really do work for treating seasonal depression, but they are also useful in general if you are indoors a lot and not getting enough natural sunlight. The reason I knew they were having an effect on me was because I had one right on my desk and would sometimes not even realize it was late in the evening and dark outside because I would be chugging away at whatever it was I was working on. That would be the only drawback to those things - make sure you shut them off during normal hours of sunset, because they can be counterproductive and keep you up in the evening. I've also found that it helped to make sure my entire place was clean and organized before going to bed, as well as always having freshly cleaned sheets and pillowcases and blankets. I've found it to be more calming knowing there were no dirty dishes in the sink, the carpet didn't need vacuuming, I didn't have mail and papers all over my table, etc... also the smell of fresh sheets and pillows made me feel like I was in a nice hotel each night. like I was kind of pampering myself.